SUMMA FOUR INC
10-Q, 1998-02-12
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>   1
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                         ------------------------------

                                    FORM 10-Q

 X   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
- ---  ACT OF 1934

     For the quarterly period ended    December 31, 1997
                                     -------------------------
 
     TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
- ---  EXCHANGE ACT OF 1934

     For the transition period from 
                                     -------------------------
               
            Commission File Number            0-22210
                                     -------------------------


                                SUMMA FOUR, INC.
             (Exact name of registrant as specified in its charter)

               Delaware                              02-0329497
      (State of Incorporation)            (IRS Employer Identification Number)

               25 Sundial Avenue, Manchester, New Hampshire 03103
              (Address of registrant's principal executive office)

                                 (603) 625-4050
                         (Registrant's telephone number)

                         ------------------------------

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes  X   No
                                       ---     ---

Indicate the number of shares outstanding of each of the issuer's classes of
common stock as of the latest practical date.

                     Common Stock, $.01 par value 6,601,697
                       Outstanding as of January 24, 1998

================================================================================
<PAGE>   2

                                SUMMA FOUR, INC.
                               INDEX TO FORM 10-Q


                                                                        Page(s)
                                                                        -------

Part I - Financial Information:

    Item 1 - Financial Statements

           Condensed Consolidated Balance Sheets as of                      1
           December 31, 1997 and March 31, 1997

           Condensed Consolidated Statements of Operations                  2
           for the three months ended December 31, 1997 and 1996
           and the nine months ended December 31, 1997 and 1996

           Condensed Consolidated Statements of Cash Flows                  3
           for the nine months ended December 31, 1997 and 1996

           Notes to Condensed Consolidated Financial Statements           4-6

    Item 2 - Management's Discussion and Analysis of                     
             Financial Condition and Results of Operations               7-11


Part II - Other Information:

    Item 1 - Legal Proceedings                                             12

    Item 2 - Changes in Securities                                         13

    Item 3 - Defaults Upon Senior Securities                               13

    Item 4 - Submission of Matters to a Vote of                            13
             Security Holders

    Item 5 - Other Information                                             13

    Item 6 - Exhibits and Reports on Form 8-K                              13

Signature(s)                                                               14



<PAGE>   3



                                                                      FORM 10-Q
                                                                      PART I
                                                                      ITEM 1
                                 SUMMA FOUR, INC.                     PAGE 1
                      Condensed Consolidated Balance Sheets
                        (In thousands, except share data)

<TABLE>
<CAPTION>
                                                    December 31, 1997    March 31, 1997
                                                    -----------------    --------------
                                                        (Unaudited)
<S>                                                      <C>                <C>     
        ASSETS
Current assets:
    Cash and cash equivalents                            $  1,360           $  6,169
    Investments - current                                  19,371              7,472
    Accounts receivable, net                               10,475             10,278
    Inventories, net                                        4,663              5,069
    Deferred income taxes                                   2,288              2,288
    Prepaid and other current assets                        3,899              1,812
                                                         --------           --------
         Total current assets                            $ 42,056           $ 33,088

Investments - non-current                                   5,997             18,686
Property and equipment, net                                 5,279              4,265
Deferred income taxes                                         226                226
Other assets                                                  598                188
                                                         --------           --------
                                                         $ 54,156           $ 56,453
                                                         ========           ========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
    Accounts payable                                     $  3,351           $  2,333
    Accrued payroll and related expenses                      930              1,016
    Other accrued liabilities                               2,916              3,704
    Deferred revenues                                       2,808              3,075
                                                         --------           --------
         Total current liabilities                         10,005             10,128

Other long-term liabilities                                   740                676

Commitments and contingencies (note 5)

Stockholders' equity:
    Preferred stock, $.01 par value; authorized
       1,000,000 shares  -- no shares issued                 --                 --
    Common stock, $.01 par value; authorized
       20,000,000 shares; issued 6,601,697
       at  December 31, 1997 and 6,411,762 at
       March 31, 1997                                          66                 64
    Additional paid-in capital                             44,187             43,662
    Accumulated earnings                                   10,368             13,149
    Cumulative translation adjustment                         (42)              --
    Unrealized gains (losses) on investments                   (9)                43
    Treasury stock, at cost, 849,098 shares at
         December 31, 1997 and 852,431 at
         March 31, 1997                                   (11,159)           (11,269)
                                                         --------           --------
         Total stockholders' equity                        43,411             45,649
                                                         --------           --------
                                                         $ 54,156           $ 56,453
                                                         ========           ========
</TABLE>

          The accompanying notes are an integral part of the condensed
                       consolidated financial statements.


<PAGE>   4



                                                                       FORM 10-Q
                                                                       PART I
                                                                       ITEM 1
                                                                       PAGE 2
                                SUMMA FOUR, INC.
                 Condensed Consolidated Statements of Operations
                                   (Unaudited)
                      (In thousands, except per share data)

<TABLE>
<CAPTION>
                                              Three Months Ended        Nine Months Ended
                                                  December 31,              December 31,
                                              --------------------     ---------------------
                                                1997         1996         1997         1996
                                                ----         ----         ----         ----

<S>                                           <C>          <C>          <C>          <C>    
Net revenues                                  $11,023      $11,624      $30,416      $32,795
Cost of revenues                                4,945        4,906       14,636       13,004
                                              -------      -------      -------      -------

Gross profit                                    6,078        6,718       15,780       19,791

Operating expenses:
      Selling, general and administrative       3,919        3,714       12,421       10,795
      Research and development                  2,902        2,500        8,551        7,528
                                              -------      -------      -------      -------

      Total operating expenses                  6,821        6,214       20,972       18,323
                                              -------      -------      -------      -------

Operating (loss) income                          (743)         504       (5,192)       1,468

Interest income, net                              327          234        1,145          783
Foreign exchange gain (loss)                      (40)                      (49)
                                              -------      -------      -------      -------

(Loss) income before income taxes                (456)         738       (4,096)       2,251

(Benefit from) provision for income taxes        (146)         281       (1,311)         855
                                              -------      -------      -------      -------


Net (loss) income                             $  (310)     $   457      $(2,785)     $ 1,396
                                              =======      =======      =======      =======


Basic Earnings Per Share

Income from continuing operations             $  (.05)     $   .08      $  (.49)     $   .23
                                              -------      -------      -------      -------

Net income                                    $  (.05)     $   .08      $  (.49)     $   .23
                                              =======      =======      =======      =======

Diluted Earnings Per Share

Income from continuing operations             $  (.05)     $   .08      $  (.49)     $   .23
                                              -------      -------      -------      -------
Net income                                    $  (.05)     $   .08      $  (.49)     $   .23
                                              =======      =======      =======      =======
</TABLE>

          The accompanying notes are an integral part of the condensed
                       consolidated financial statements.

<PAGE>   5



                                                                       FORM 10-Q
                                                                       PART I
                                                                       ITEM 1
                                                                       PAGE 3
                                SUMMA FOUR, INC.
                 Condensed Consolidated Statements of Cash Flows
                                   (Unaudited)
                                 (In thousands)

<TABLE>
<CAPTION>
                                                                  Nine Months Ended
                                                                     December 31,
                                                                 --------------------
                                                                   1997         1996
                                                                 -------      -------
<S>                                                              <C>          <C>    
Cash flows from operating activities:
Net (loss) income                                                $(2,785)     $ 1,396
                                                                 -------      -------
Adjustments to reconcile net (loss) income to net
    cash (used in) provided by operating activities:
    Depreciation and amortization                                  2,005        1,765
    Provision for doubtful accounts                                  115          150
    Provision for excess and obsolete inventory                       15
Changes in operating assets and liabilities:
    Accounts receivable                                             (312)        (829)
    Inventory                                                        391       (1,861)
    Prepaid and other current assets                              (2,087)         (11)
    Other assets                                                    (193)         183
    Accounts payable                                               1,018          679
    Accrued payroll and related expense                              (86)         477
    Other accrued liabilities                                       (968)        (202)
                                                                 -------      -------
Total adjustments                                                   (102)         351
                                                                 -------      -------
         Net cash (used in) provided by operating
              activities                                          (2,887)       1,747
                                                                 -------      -------
Cash flows from investing activities:
    Purchases of property and equipment                           (3,019)      (1,917)
    Sales/purchases of investments, net                              738        7,589
                                                                 -------      -------
         Net cash (used in) provided by operating
              activities                                          (2,281)       5,672
                                                                 -------      -------
Cash flows from financing activities:
    Proceeds from the sale of stock under stock
         option plans                                                229          130
    Reissuance/(purchase) of treasury stock                          196       (2,324)
    Principal payments under capital lease obligations               (24)         (24)
                                                                 -------      -------
         Net cash provided by (used in) financing
             activities                                              401       (2,218)
Effect of exchange rate changes on cash                              (42)
                                                                 -------      -------
Net decrease in cash and cash equivalents                         (4,809)       5,201
Cash and cash equivalents, beginning of period                     6,169        4,681
                                                                 -------      -------
Cash and cash equivalents, end of period                         $ 1,360      $ 9,882
                                                                 =======      =======

Supplemental disclosure of cash flow information:
    Cash paid for interest                                       $     8      $    10
    Cash paid for income taxes                                   $ 1,107      $   746

Supplemental disclosure of non-cash investing 
and financing activities:
    Exercise of stock options                                    $   217      $    33
</TABLE>

   The accompanying notes are an integral part of the condensed consolidated
                             financial statements.

<PAGE>   6



                                                                       FORM 10-Q
                                                                       PART I
                                                                       ITEM 1
                                                                       PAGE 4

                                SUMMA FOUR, INC.
         Notes to Unaudited Condensed Consolidated Financial Statements
                                December 31, 1997

1.   BASIS OF PRESENTATION

          The accompanying unaudited condensed consolidated financial statements
          have been prepared in accordance with generally accepted accounting
          principles for interim financial information and pursuant to the rules
          and regulations of the Securities and Exchange Commission.
          Accordingly, they do not include all of the information and footnotes
          required by generally accepted accounting principles for complete
          financial statements.

          In the opinion of management, all adjustments (consisting only of
          normal recurring adjustments) considered necessary for a fair
          presentation have been included. Operating results for the three month
          period ended December 31, 1997 are not necessarily indicative of the
          results that may be expected for the year ended March 31, 1998. For
          further information, refer to the Company's consolidated financial
          statements and notes thereto contained in the Company's Annual Report
          on Form 10-K for the year ended March 31, 1997 and the Quarterly
          Report on Form 10-Q for the quarter ended September 30, 1997, filed
          with the Securities and Exchange Commission. The year-end condensed
          balance sheet data was derived from audited financial statements, but
          does not include all disclosures required by generally accepted
          accounting principles.

2.   INVENTORIES

          Inventories, valued at the lower of cost (determined using the
          first-in, first-out method) or market were as follows (in thousands):

<TABLE>
<CAPTION>
                              December 31, 1997     March 31, 1997
                              -----------------     --------------

           <S>                     <C>                  <C>   
           Raw materials           $2,242               $1,652
           Work-in-process          1,378                1,795
           Finished goods           1,043                1,622
                                   ------               ------
                                   $4,663               $5,069
                                   ======               ======
</TABLE>

3.   MAJOR CUSTOMER INFORMATION

          Historically, a significant portion of the Company's net revenues is
          derived from a limited number of customers. Approximately 29% of the
          Company's net revenues for the nine months ended December 31, 1997
          were from three customers accounting for 10%, 10%, and 9%,
          respectively, of net revenues. Approximately 28% of the Company's net
          revenues for the nine months ended December 31, 1996 were from three
          customers accounting for 11%, 9%, and 8%, respectively, of net
          revenues.


<PAGE>   7



                                                                       FORM 10-Q
                                                                       PART I
                                                                       ITEM 1
                                                                       PAGE 5

4.   RECENT PRONOUNCEMENT

          In February 1997, the Financial Accounting Standards Board issued
          Statement of Financial Accounting Standards No. 128 ("SFAS No. 128"),
          "Earnings per Share." SFAS No. 128 establishes a different method of
          computing earnings per share than was required under the provisions of
          Accounting Principles Board Opinion No. 15, "Earnings per Share."
          Under SFAS No. 128, the Company is required to present both basic
          earnings per share and diluted earnings per share. The Company has
          adopted SFAS No. 128 in its third (current) quarter for fiscal 1998
          and all historical earnings per share data presented has been restated
          to conform to the provisions of SFAS No. 128, where applicable.

          In June 1997, the Financial Accounting Standards Board issued SFAS No.
          130, "Reporting Comprehensive Income." This statement requires that
          changes in comprehensive income be shown in a financial statement that
          is displayed with the same prominence as other financial statements.
          The statement will be effective for annual periods beginning after
          December 15, 1997 and the Company will adopt its provisions in fiscal
          1999. Reclassification for earlier periods is required for comparative
          purposes. The Company is currently evaluating the impact this
          statement will have on its financial statements; however, because the
          statement requires only additional disclosure, the Company does not
          expect the statement to have a material impact on its financial
          position or results of operations.

          In June 1997, the Financial Accounting Standards Board issued SFAS No.
          131, "Disclosures about Segments of an Enterprise and Related
          Information." This statement supersedes SFAS No. 14, "Financial
          Reporting for Segments of a Business Enterprise." This statement
          includes requirements to report selected segment information quarterly
          and entity-wide disclosures about products and services, major
          customers, and the material countries in which the entity holds assets
          and reports revenues. The statement will be effective for annual
          periods beginning after December 15, 1997 and the Company will adopt
          its provisions in fiscal 1999. Reclassifications for earlier periods
          is required, unless impracticable, for comparative purposes. The
          Company is currently evaluating the impact this statement will have on
          its financial statements; however, because the statement requires only
          additional disclosure, the Company does not expect the statement to
          have a material impact on its financial position or results of
          operations.

          In October 1997, the American Institute of Certified Public
          Accountants ("AICPA") issued the statement of position ("SOP") 97-2
          "Software Revenue Recognition," which will supersede SOP 91-1. SOP
          97-2 has not changed the basic rules of revenue recognition but does
          provide more guidance, particularly with respect to multiple
          deliverables and "when and if available" products. SOP 97-2 is
          effective for transactions entered into for annual periods beginning
          after December 15, 1997. The Company will adopt SOP 97-2 in fiscal
          1999 and has not yet determined its impact.

<PAGE>   8
                                                                      FORM 10-Q
                                                                      PART I
                                                                      ITEM 1
                                                                      PAGE 6

5.   CONTINGENCIES

          On August 2, 1995, Claircom Communications Group, Inc. ("Claircom")
          brought an action against the Company in King County (Washington)
          Superior Court alleging breach of contract, breach of warranty, and
          various related claims and seeking an accounting and damages arising
          from the joint development of a cabin telecommunications unit (CTU),
          which is part of a cabin communications system, to be installed in
          commercial passenger aircraft for providing communications services
          between the aircraft and the ground. On October 11, 1995, the Company
          filed an answer in the Washington action denying Claircom's
          allegations and asserted a Counterclaim. The Company also brought an
          action against Claircom, in the Hillsborough County (New Hampshire)
          Superior Court on September 12, 1995, seeking payment of royalties,
          protection of its trade secrets and damages for breach of contract
          under certain New Hampshire statutes. Claircom filed a Motion to
          Dismiss or Stay the New Hampshire action. On October 12, 1995, the New
          Hampshire court denied the Company's motion for preliminary injunction
          and Claircom's motion to dismiss or stay. On October 30, 1995, the
          Washington court granted the Company's motion to stay the Washington
          action. Claircom's motions to reconsider the orders of the New
          Hampshire and the Washington courts were denied. On May 9, 1997, the
          Court allowed Claircom's motion to amend its counterclaims to add
          claims for fraudulent inducement, intentional misrepresentation and a
          claim under the New Hampshire Consumer Protection Act. The Company
          moved to dismiss these new counterclaims, and Claircom moved to
          dismiss, or for partial summary judgment on, the Company's claim under
          the New Hampshire Consumer Protection Act. On August 28, 1997 the
          Court dismissed both parties' consumer protection act claims, and
          denied the Company's motion to dismiss the new fraud claims. On
          November 25, 1997, Claircom moved for partial summary judgment on its
          claim that the Company had converted its rights in the invention which
          is now embodied in U.S. Patent No. 5,553,135. On January 27, 1998, the
          Court denied that motion. The parties disclosed their experts on
          December 8, 1997. On December 19, 1997 the Company moved to preclude
          Claircom from offering testimony from its experts at trial. On January
          15, 1998, the Court denied that motion. On January 9, 1998, Claircom
          filed a motion to amend its counterclaims and to add a claim under the
          New Hampshire Trade Secrets statute. The Company did not oppose the
          motion, and the Court has not yet ruled on the motion . Discovery is
          ongoing but will close on March 6, 1998. The Court has set a trial
          commencement date of May 5, 1998.

          On June 20, 1997 the Company commenced an action in the United States
          District Court for the District of Delaware against AT&T Wireless
          Services, Inc. and Claircom, Civil No. 97-335. That action asserts
          that the defendants have infringed, and will continue to infringe, US
          Patent Number 5,553,135 (the " '135 patent") owned by the Company.
          Specifically the action contends that the defendants have violated the
          '135 patent by making, using, selling or offering to sell cabin
          telecommunications units employing the technology claimed and
          disclosed in the '135 patent. The defendants have filed an answer and
          counterclaim asserting that the '135 patent is invalid and not
          infringed and that three individuals should be added as inventors on
          the '135 patent. In addition, the defendants have filed a motion to
          stay the patent litigation pending the outcome of the New Hampshire
          legal proceedings. The Company opposes this motion. The Court heard
          oral argument on the motion on November 24, 1997 and took the motion
          under advisement. The suit is in its early stages, and the Company is
          unable to express a view as to its outcome.

          The Company, after consultation with external counsel, has estimated
          pre-trial costs to be approximately $948 thousand and recorded the
          costs.


<PAGE>   9

                                                                       FORM 10-Q
                                                                       PART I
                                                                       ITEM 2
                                                                       PAGE 7
                                SUMMA FOUR, INC.
                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations
                                December 31, 1997


The statements contained in this Quarterly Report on Form 10-Q which are not
purely historical are forward-looking statements within the meaning of Section
27a of the Securities Act of 1933 and section 21E of the Securities Exchange Act
of 1934, including statements regarding the Company's expectations, hopes,
intentions or strategies regarding the future. Without limiting the foregoing,
the words "believes," "anticipates," "plans," "expects," and similar expressions
are intended to identify forward-looking statements. All forward-looking
statements included in this document are based on information available to the
Company on the date hereof, and the Company assumes no obligation to update any
such forward-looking statements. It is important to note that there are a number
of important factors that could cause the Company's actual results to differ
materially from those indicated in any such forward-looking statements. These
factors include, without limitation, those set forth under the caption below
"Factors That May Affect Future Operating Results".

RESULTS OF OPERATIONS

THREE MONTHS ENDED DECEMBER 31, 1997 COMPARED WITH THREE MONTHS ENDED 
DECEMBER 31, 1996.

Net revenues decreased by $.6 million (5.2%) to $11.0 million for the three
months ended December 31, 1997 compared to $11.6 million, for the three months
ended December 31, 1996. Shipments to the Company's application developers and
reseller customers represented approximately 70% of revenues for the three
months ended December 31, 1997 compared to 62% for the three months ended
December 31, 1996. Shipments to international customers represented
approximately 31% of total revenues for the quarter ended December 31, 1997
versus 38% for the same quarter in 1996. The Company believes that its net
revenues may be adversely affected in certain periods preceding the introduction
of an enhanced version of its VCO 20 switch targeted for the fourth quarter of
fiscal 1998 and a new line of standards-based programmable switches targeted for
fiscal 1999.

Gross profit decreased by $.6 million (9.5%) to $6.1 million for the three
months ended December 31, 1997 compared to $6.7 million for the three months
ended December 31, 1996. Gross margin decreased to 55.1% in the three months
ended December 31, 1997 from 57.8% in the three months ended December 31, 1996.
The decrease in gross margin, when compared to the same quarter in the previous
fiscal year, was primarily attributable to a shift in sales mix to systems which
contain lower margin components, an increase in service revenues which typically
generate lower gross margins, and expediting and reconfiguration costs related
to delivery of production materials. The Company does not believe that the
current gross margins are necessarily indicative of future gross margins which
may be affected by the level of net revenues, customer mix, cost of components,
and discounts granted to high volume purchasers. The Company's gross margins
have been declining primarily due to increased use of indirect channels of
distribution.

Selling, general and administrative expenses increased by $.2 million (5.5%) to
$3.9 million, or 35.6% of net revenues, for the three months ended December 31,
1997 compared with $3.7 million, or 32.0% of net revenues,

<PAGE>   10


                                                                       FORM 10-Q
                                                                       PART I
                                                                       ITEM 2
                                                                       PAGE 8

for the three months ended December 31, 1996. This increase in expenses was
primarily due to increased travel, recruiting and consulting activities
attributable to the growth of the Company's sales force over the past year.

Research and development expenses were $2.9 million or 26.3% of net revenues for
the three months ended December 31, 1997 compared to $2.5 million or 21.5% of
net revenues for the three months ended December 31, 1996. The Company believes
that its current spending level on research and development is required to
advance its position as a core network supplier for telecommunications service
providers. Included are costs attributable to research and development directed
to the enhanced VCO/20 switch and, jointly with Dialogic Corporation and
Junction, Inc., a new line of standards based programmable switches.

Operating income decreased by $1.2 million to a loss of $.7 million for the
three months ended December 31, 1997 compared to a profit of $.5 million for the
three months ended December 31, 1996. The decrease was primarily due to revenue
shortfall related to lower domestic sales, lower gross margins and increased
research and development spending attributable to ongoing new product
development efforts.


NINE MONTHS ENDED DECEMBER 31, 1997 COMPARED WITH NINE MONTHS ENDED 
DECEMBER 31, 1996

Net revenues for the nine months ended December 31, 1997 decreased by $2.4
million (7.3%) to $30.4 million, from $32.8 million for the nine months ended
December 31, 1996.

Gross profit decreased by $4.0 million (20.3%), to $15.8 million primarily due
to a decrease in revenues in the quarter ended June 30, 1997, the inventory
write off in the quarter ended September 30, 1997 and competitive margin
pressure, as compared to $19.8 million for the nine months ended December 31,
1996. Gross margin decreased to 51.9% during the nine months ended December 31,
1997 from 60.3% in the nine months ended December 31, 1996.

Selling, general and administrative expenses increased by $1.6 million (15.1%)
to $12.4 million, or 40.8% of revenues, for the nine months ended December 30,
1997 compared with $10.8 million, or 32.9% of net revenues, in the same period
of fiscal 1997. This increase resulted primarily from special charges for
anticipated Claircom legal expenses, other costs related to personnel and
severance activities, and expansion of the company's sales and support
functions.

Research and development expenses increased by $1.0 million (13.6%) to $8.6
million, or 28.1% of net revenues, for the nine months ended December 31, 1997
compared to $7.5 million, or 23% of net revenues, in the same period of fiscal
1997. This increase is primarily due to the Company's spending for research and
development directed to the enhanced VCO/20 switch, a new line of programmable
switches and additional product functionality as it relates to integrated SS-7,
network management, scalability, certifications, subrate switching and the
development of future products.

Operating income decreased by $6.7 million to a loss of $5.2 million, or (17.1%)
of net revenues, for the nine months ended December 31, 1997 compared to income
of $1.5 million, or 4.5% of net revenues for the nine months ended December 31,
1996. The decrease was primarily due to revenue shortfall related to lower
domestic sales, lower gross margins attributable to the special charge related
to inventory write-off, competitive margin pressure, shifts in system mix,
special charges for anticipated legal expenses and other costs related to
personnel and severance related activities.
<PAGE>   11

                                                                      FORM 10-Q
                                                                      PART I
                                                                      ITEM 2
                                                                      PAGE 9


LIQUIDITY AND CAPITAL RESOURCES

At December 31, 1997, the Company had $26.7 million in cash, cash equivalents
and investments. At March 31, 1997, the Company had $32.3 million in cash, cash
equivalents and investments. This decrease is primarily due to severance
compensation, expenditures for capital equipment and expenditures attributable
to research and development efforts related to the Company's enhanced VCO/20
switch. At December 31, 1997, the ratio of current assets to current liabilities
was 4.2:1 compared to 3.3:1 at March 31, 1997. Purchase commitments to suppliers
of the Company's products were approximately $5.9 million and $9.7 million at
December 31, 1997 and March 31, 1997, respectively.

The Company maintains an unsecured bank line of credit in the amount of $6.0
million. At December 31, 1997, no borrowings were outstanding under this line.
Unless renewed, the line expires in September 1998. This line bears interest at
the bank's prime interest rate per annum (8.5% at December 31, 1997). The
Company believes that cash generated from operations and the total of its cash
and current investments, together with existing sources of debt financing, will
be sufficient to meet its anticipated cash requirements for working capital and
capital expenditures for at least the next twelve months.

On December 16, 1996, the Company's Board of Directors authorized the repurchase
of up to 500,000 shares of common stock as an extension of the Company's
repurchase program. As of December 31, 1997, the Company had repurchased a
cumulative total of 405,065 shares related to this extension at an average cost
of $10.16 per share and had reissued 26,933 shares at an average price of $7.68
related to purchases under its Employee Stock Purchase Plan. The repurchases
were funded through the Company's cash and investments. The Company has no
immediate plans to continue to repurchase shares but may elect to repurchase
additional shares of it's stock, at some future point, depending on stock market
conditions, price per share and other factors.

The Company does not consider the impact of inflation on its business activities
to have been significant to date.


<PAGE>   12




                                                                       FORM 10-Q
                                                                       PART I
                                                                       ITEM 2
                                                                       PAGE 10

FACTORS THAT MAY AFFECT FUTURE OPERATING RESULTS

A number of uncertainties exist that could affect the Company's future operating
results, including without limitation, the following:

     o    The Company has recently announced agreements in principle with
          Dialogic Corporation and Junction, Inc. which it anticipates will
          result in the development of a new line of standards based
          programmable switches targeted for fiscal 1999. The Company
          anticipates that the expenses associated with this developmental
          activity will be funded from operations. There can be no assurance
          that these products will be developed in a cost effective manner and
          be available for sale within the time frame anticipated by the
          Company. Failure to do so could have a materially adverse effect on
          the Company's business and results of operations.

     o    The Company is dependent upon sole source suppliers for certain key
          components used in its products. The Company purchases these sole
          source components pursuant to purchase orders placed from
          time-to-time. No assurance can be given that sole source suppliers
          will devote the resources necessary to support the enhancement or
          continued availability of such components or that any such supplier
          will not encounter financial or operational difficulties. In addition,
          in certain instances, components required for certain subassemblies
          used in the Company's products are no longer being manufactured. The
          Company has historically been able to secure such components by
          utilizing its network of suppliers. However, the Company is
          redesigning such sub-assemblies in order to eliminate production
          interruptions that could occur if such components cannot be acquired.
          The Company is actively seeking alternative solutions to address
          potentially serious delays or shortages from its major component
          supplier. If delays or shortages occur and the Company is unable to
          effect alternative supply arrangements, its business and results of
          operations could be materially adversely affected.

     o    A variety of factors could influence the level of the Company's net
          revenues in a particular quarter, including general worldwide or
          specific geographic economic conditions within the telecommunications
          switching or other related industries, the timing of significant
          orders, shipment delays, the introduction of new products by the
          Company, the introduction of new products by the Company's
          competitors, acquisitions by the Company, patterns of capital spending
          by customers and other factors, many of which are beyond the Company's
          control. Since a substantial portion of the expenses of the Company do
          not vary relative to sales levels, if net revenues in a particular
          quarter do not meet expectations, it could have a material adverse
          effect on the Company's results of operations.

     o    The Company's gross margin has declined in recent periods as a result
          of sales price variations, an increase in the relative percentage of
          international and service revenues, and a shift in system mix to
          systems which contain certain lower margin components. Gross margins
          are also affected by other factors such as changes in the cost of
          materials, production and quality considerations, and the timing of
          new product introductions. The Company from time-to-time adds
          functionality and features that could add cost to its products which
          would adversely affect gross margins if the Company is not able to
          increase the price of such systems to offset such increased costs.


<PAGE>   13



                                                                       FORM 10-Q
                                                                       PART I
                                                                       ITEM 2
                                                                       PAGE 11


     o    The Company's future results of operation and financial condition will
          depend, in part, on its ability to obtain and maintain patent
          protection for its products, to preserve its trade secrets and to
          operate without infringing on proprietary rights of third parties.
          There can be no assurance that the Company will be able to obtain
          and/or adequately protect the intellectual property required for it to
          compete effectively.

     o    The Company's ability to develop marketable products and maintain a
          competitive position in light of continuing technological developments
          will depend, in large part, on its ability to attract and retain
          highly qualified management, technical and sales and marketing
          personnel. Competition for the services of these key employees is
          intense.

     o    The Company's international business is subject to a number of
          inherent risks, including the challenges of building and managing
          foreign operations, unique product requirements, fluctuations in the
          value of foreign currencies, import/export duties, and unexpected
          regulatory, economic or political changes in foreign markets.

Because of these and other factors, past financial performance should not be
considered an indictor of future performance.


<PAGE>   14



                                                                       FORM 10-Q
                                                                       PART II
                                                                       ITEM 1-6
                                                                       PAGE 12
                                SUMMA FOUR, INC.
                           Part II - Other Information
                                December 31, 1997

ITEM 1 - LEGAL PROCEEDINGS

     On August 2, 1995, Claircom Communications Group, Inc. ("Claircom") brought
     an action against the Company in King County (Washington) Superior Court
     alleging breach of contract, breach of warranty, and various related claims
     and seeking an accounting and damages arising from the joint development of
     a cabin telecommunications unit (CTU), which is part of a cabin
     communications system, to be installed in commercial passenger aircraft for
     providing communications services between the aircraft and the ground. On
     October 11, 1995, the Company filed an answer in the Washington action
     denying Claircom's allegations and asserted a Counterclaim. The Company
     also brought an action against Claircom, in the Hillsborough County (New
     Hampshire) Superior Court on September 12, 1995, seeking payment of
     royalties, protection of its trade secrets and damages for breach of
     contract under certain New Hampshire statutes. Claircom filed a Motion to
     Dismiss or Stay the New Hampshire action. On October 12, 1995, the New
     Hampshire court denied the Company's motion for preliminary injunction and
     Claircom's motion to dismiss or stay. On October 30, 1995, the Washington
     court granted the Company's motion to stay the Washington action.
     Claircom's motions to reconsider the orders of the New Hampshire and the
     Washington courts were denied. On May 9, 1997, the Court allowed Claircom's
     motion to amend its counterclaims to add claims for fraudulent inducement,
     intentional misrepresentation and a claim under the New Hampshire Consumer
     Protection Act. The Company moved to dismiss these new counterclaims, and
     Claircom moved to dismiss, or for partial summary judgment on, the
     Company's claim under the New Hampshire Consumer Protection Act. On August
     28, 1997 the Court dismissed both parties' consumer protection act claims,
     and denied the Company's motion to dismiss the new fraud claims. On
     November 25, 1997, Claircom moved for partial summary judgment on its claim
     that the Company had converted its rights in the invention which is now
     embodied in U.S. Patent No. 5,553,135. On January 27, 1998, the Court
     denied that motion. The parties disclosed their experts on December 8,
     1997. On December 19, 1997, the Company moved to preclude Claircom from
     offering testimony from its experts at trial. On January 15, 1998, the
     Court denied that motion. On January 9, 1998, Claircom filed a motion to
     amend its counterclaims and to add a claim under the New Hampshire Trade
     Secrets statute. The Company did not oppose the motion, and the Court has
     not yet ruled on the motion. Discovery is ongoing but will close on March
     6, 1998. The Court has set a trial commencement date of May 5, 1998.

     On June 20, 1997 the Company commenced an action in the United States
     District Court for the District of Delaware against AT&T Wireless Services,
     Inc. and Claircom, Civil No. 97-335. That action asserts that the
     defendants have infringed, and will continue to infringe, US Patent Number
     5,553,135 (the " '135 patent") owned by the Company. Specifically the
     action contends that the defendants have violated the '135 patent by
     making, using, selling or offering to sell cabin telecommunications units
     employing the technology claimed and disclosed in the '135 patent. The
     defendants have filed an answer and counterclaim asserting that the '135
     patent is invalid and not infringed and that three individuals should be
     added as inventors on the '135 patent. In addition, the defendants have
     filed a motion to stay the patent litigation pending the outcome of the New
     Hampshire legal proceedings. The Company opposes this motion. The Court
     heard oral argument on the motion on November 24, 1997 and took the motion
     under advisement. The suit is in its early stages, and the Company is
     unable to express a view as to its outcome.

     The Company, after consultation with external counsel, has estimated
     pre-trial costs to be approximately $948 thousand and recorded the costs.
<PAGE>   15

                                                                       FORM 10-Q
                                                                       PART II
                                                                       PAGE 13

ITEM 2 - CHANGES IN SECURITIES

         Not applicable.

ITEM 3 - DEFAULTS UPON SENIOR SECURITIES

         Not applicable.

ITEM 4 - SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

          Not applicable.


ITEM 5 - OTHER INFORMATION

          Not applicable.

ITEM 6 - EXHIBITS AND REPORTS ON FORM 8-K

     a.   EXHIBITS

          The exhibits listed in the Exhibit Index are part of or included in
          this report.

     b.   REPORTS ON FORM 8-K

          None.

<PAGE>   16




                                                                       FORM 10-Q
                                                                       PART II
                                                                       PAGE 14



                                   SIGNATURES
                                   ----------



Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.



                                      Summa Four, Inc.
                                      
                                      
                                      
Date:  February 11, 1998              
                                      ------------------------------------------
                                      Robert A. Degan
                                      President and Chief Executive Officer
                                      
                                      
                                      
                                      
                                      
Date:  February 11, 1998              
                                      ------------------------------------------
                                      Jeffrey A. Weber
                                      Vice President and Chief Financial Officer
                                    



<PAGE>   17


                                                                       FORM 10-Q
                                                                       PART II
                                                                       PAGE 15


Exhibit No.             Description
- -----------             -----------

11.0                    Statement Re:  Computation of per Share Earnings

27.                     Financial Data Schedule




<PAGE>   1





                                                                    EXHIBIT 11.0
                                                                    FORM 10-Q
                                                                    PART II
                                                                    PAGE 16

                        Computation of Earnings Per Share
                      (In thousands, except per share data)

<TABLE>
<CAPTION>
                                          Three Months Ended      Nine Months Ended
                                             December 31,           December 31,
                                             ------------           ------------

                                           1997        1996       1997         1996
                                           ----        ----       ----         ----

<S>                                       <C>         <C>        <C>          <C>   
Basic

Average shares outstanding of
Common Stock                               5,752       5,913       5,683       6,001
                                          ======      ======     =======      ======

Net (loss) income                         $ (310)     $  457     $(2,785)     $1,396

Per share amount                          $ (.05)     $  .08     $  (.49)     $  .23
                                          ======      ======     =======      ======
</TABLE>



<TABLE>
<CAPTION>
                                           1997        1996       1997         1996
                                           ----        ----       ----         ----

<S>                                       <C>         <C>        <C>          <C>   
Diluted

Average shares outstanding of
Common Stock                               5,752       5,913       5,683       6,001

Net effect of dilutive stock options-
based on the treasury stock method          --           137        --           183
                                          ------      ------     -------      ------
           Total                           5,752       6,050       5,683       6,184
                                          ======      ======     =======      ======

Net (loss) income                         $ (310)     $  457     $(2,785)     $1,396

Per share amount                          $ (.05)     $  .08     $  (.49)     $  .23
                                          ======      ======     =======      ======
</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          MAR-31-1998
<PERIOD-START>                             APR-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                           1,360
<SECURITIES>                                    25,368
<RECEIVABLES>                                   10,803
<ALLOWANCES>                                       328
<INVENTORY>                                      4,663
<CURRENT-ASSETS>                                42,056
<PP&E>                                          14,828
<DEPRECIATION>                                   9,549
<TOTAL-ASSETS>                                  54,156
<CURRENT-LIABILITIES>                           10,005
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            66
<OTHER-SE>                                      43,345
<TOTAL-LIABILITY-AND-EQUITY>                    54,156
<SALES>                                         30,416
<TOTAL-REVENUES>                                30,416
<CGS>                                           14,636
<TOTAL-COSTS>                                   14,636
<OTHER-EXPENSES>                                20,972
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   9
<INCOME-PRETAX>                                (4,096)
<INCOME-TAX>                                   (1,311)
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (2,785)
<EPS-PRIMARY>                                   (0.49)
<EPS-DILUTED>                                   (0.49)
        

</TABLE>


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